Path: utzoo!attcan!uunet!decwrl!elroy.jpl.nasa.gov!ncar!stout.atd.ucar.edu!thor
From: thor@stout.atd.ucar.edu (Rich Neitzel)
Newsgroups: comp.windows.x
Subject: Re: Setting up DISPLAY environment variable
Message-ID: <7956@ncar.ucar.edu>
Date: 11 Jul 90 18:46:07 GMT
References: <143@percival.albany.edu>
Sender: news@ncar.ucar.edu
Reply-To: thor@stout.atd.ucar.edu (Rich Neitzel)
Organization: National Center for Atmospheric Research
Lines: 35

In article <143@percival.albany.edu>, narten@percival.albany.edu (Thomas
Narten) writes:
|>In article  <9173@uswat.UUCP> bar@uswat.uswest.com (Bala Ramakrishnan
595-2868) writes:
|>>My .cshrc file has : setenv DISPLAY localhost:0
|>>
|>>However, when I rlogin to the sparc server, the same .cshrc file gets
|>>executed and DISPLAY is set to localhost:0. When I am on the sparc
|>>server, my .cshrc file should set DISPLAY to <internet addr of sun3/80>:0
|>
|>Setting DISPLAY in either .cshrc or .login is asking for trouble.

Well, I disagree. I do set DISPLAY in my .login, but only if the TERM is
an xterm. Then I know that the original host is running X (of course, if
you rlogin from the second host to a third it fails!). Here's what I do:

if ($TERM == "xterm") then
   if ($?DISPLAY) then
      exit 0
   else
      setenv DISPLAY  `who am i | tr -s '('')'' ''\011' ' ' | cut -f6 -d" " \
	| cut -d"." -f1`":0"
   endif
endif

The first tr removes multiple spaces and any tabs (SunOs 4.1 who am i
puts out both!). The second cut is used to correctly parse fully
qualified names and simple names (i.e, it handles surt &
surt.atd.ucar.edu correctly). I've only done this on Sun-3/4s under
SunOs 4.0.3 & 4.1.
                                                                            
Richard Neitzel thor@thor.atd.ucar.edu	     	Torren med sitt skjegg
National Center For Atmospheric Research	lokkar borni under sole-vegg
Box 3000 Boulder, CO 80307-3000			Gjo'i med sitt shinn
303-497-2057					jagar borni inn.